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PTOE Exam Prep > Traffic Engineering Studies > Flashcards

Traffic Engineering Studies Flashcards

1
Q

What are the purposes of traffic engineering studies?

A
  • to determine the characteristics of highway system users and their vehicles
  • to monitor system operation
  • to identify problem areas
  • to assist in developing appropriate remedial action
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2
Q

Mean

A

average

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3
Q

Median

A

50th percentile value - half of values are more, half are less

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4
Q

Mode

A

the most frequent value of x

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5
Q

Standard deviation

A

measure of dispersion

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6
Q

Regression-to-the-mean

A

After a period of comparatively high crash frequency, it is statistically probable that the following period will have a comparatively low crash frequency

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7
Q

Delay

A

additional travel time experienced

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8
Q

Spot Speed

A

instantaneous speed of a vehicle passing a point on the roadway

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9
Q

Journey Speed

A

distance divided by the total journey time

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10
Q

Running Speed

A

distance divided by the running time

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11
Q

Time Mean Speed

A

arithmetic mean of spot speeds

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12
Q

Space Mean Speed

A

mean travel speed of vehicles traveling a roadway segment of a known distance

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13
Q

Capacity

A

maximum traffic flow that can be accommodated in a facility during a given time period under prevailing roadway, traffic, and control conditions

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14
Q

Purpose of travel time studies

A

Evaluate the quality of traffic movement along a route and determine the locations, types, and extent of traffic delays

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15
Q

Travel Time

A

elapsed time of travel

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16
Q

Running Time

A

time that the vehicle is actually in motion

17
Q

Travel speed

A

overall average speed

18
Q

Running speed

A

distance divided by running time

19
Q

Fixed Delay

A

regardless of the amount of traffic

20
Q

Operational Delay

A

interference from other components of the traffic stream

21
Q

Control Delay

A

delay attributable to the intersection traffic control device

22
Q

Purpose of No Passing Zone study

A

to establish limits on the roadway which permit the passing driver the necessary sight distance to allow a safe completion of the passing maneuver

23
Q

Spot speed study

A

measures individual speeds of a sample of vehicles passing a point on the roadway

24
Q

When should speed studies be conducted?

A

during off peak hours, when traffic is free flowing

25
Q

What sample size is needed for spot speed studies?

A

100 vehicles per lane

26
Q

Speed Zoning

A

establishment of safe, reasonable speed limits for certain sections of highway where the statutory speed limits do not fit the roadway and traffic conditions

27
Q

A posted speed limit must be within ___ mph of the ___ percentile speed of free-flowing traffic

A

5 mph
85th

28
Q

What factors may be considered when establishing speed limits?

A

1) Road characteristics, shoulder condition, grade, alignment, sight distance
2) Pace
3) Roadside development and environment
4) Parking practices and pedestrian activity
5) Reported crash experiencer at least a 12-month period

29
Q

Pedestrian walking speed

A

3.5 feet per second

30
Q

AADT

A

average annual daily traffic

average 24-hour volume at a given location over a full 365-day year

31
Q

ADT

A

average daily traffic

average 24-hour volume recorded for some period less than a year

32
Q

AWT

A

average weekday traffic

average daily traffic, M-F

33
Q

DHV

A

design hourly volume

one-hour volume used as the basis of design or traffic operational decisions

34
Q

Collision studies

A

Traffic safety studies that use crash reports to assess safety by evaluating number, type, and severity of crashes along a roadway segment or intersection

35
Q

Gap study

A

determines the number of gaps in vehicle traffic that are of adequate length to permit pedestrians to cross the street

36
Q

Site Impact Studies

A

determine the needs for any improvements to the adjacent and nearby transportation system to maintain a satisfactory level of service, safety, and access to a proposed land development

37
Q

Site Impact Analysis steps

A
  • site traffic generation
  • site traffic distribution and assignment
  • non-site traffic forecast
  • analysis of LOS at intersections
  • site access improvements
  • internal site circulation and parking analysis
38
Q

By federal law, every urbanized area over ________ population must have a transportation planning process

A

50,000

39
Q

Areas with populations greater than __________ are designated transportation management areas (TMAs)

A

200,000

PTOE Exam Prep (6 decks)

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